PyPubSub provides a publish - subscribe API that facilitates the development of 
event-based (also known as message-based) applications. PyPubSub supports sending and 
receiving messages between objects of an application, as well as a variety of 
advanced features that facilitate debugging and maintaining topics and messages
in larger applications. 

See the PyPubSub website (http://pubsub.sourceforge.net/) for 
further details, and to download. 

Latest stable version, 3.3.0:

* `Zip (source) <http://downloads.sf.net/project/pubsub/pubsub/3.3.0/PyPubSub-3.3.0.zip>`_
* `Windows Installer  <http://downloads.sf.net/project/pubsub/pubsub/3.3.0/PyPubSub-3.3.0.win32.exe>`_
* `Egg for Python 2.7 <https://downloads.sourceforge.net/project/pubsub/pubsub/3.3.0/PyPubSub-3.3.0-py2.7.egg>`_
* `Egg for Python 3.3 <https://downloads.sourceforge.net/project/pubsub/pubsub/3.3.0/PyPubSub-3.3.0-py3.3.egg>`_

Release candidate version, 3.4: 

* Not yet available

